Blue eggs anyone?

I orderd some Bantam chicken eggs for hatching. The seller had a photo of really blue eggs. When I got them they were green like the ee eggs i get from 2 of the hens I have now. One of them though was light blue not green. This egg became my favorite of course and amazingly was the only one to hatch on its own.

(one other chick hatched with my help after 24 hours of struggling this one has a bad foot and can not walk right but my sister has fallen in love with it so it will have a great life)

So now I have this perfect little chick from my only blue egg. I was wondering how blue can they get and does anyone have any real blue (not green) hatching eggs that I could buy I would love to get some more.